Losses Assessment in some Egyptian Wheat Cultivars caused by Stripe Rust Pathogen (Puccinia striiformis) | ||
| Egyptian Journal of Phytopathology | ||
| Article 14, Volume 44, Issue 1, June 2016, Pages 191-203 PDF (539.08 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejp.2016.92381 | ||
| Authors | ||
| Reda Omara* 1; Doaa El-Naggar1; Nagwa Abd El-Malik1; Hammad Ketta2 | ||
| 1Plant Pathol. Res. Inst. Agric. Res. Centre, Giza, Egypt | ||
| 2Agric. Botany Dept., Plant Pathol. Branch, Fac. Agric., Kafr- Elsheikh Univ., Egypt | ||
| Abstract | ||
| Seven Egyptian wheat (Triticum aestivum L.) cultivars were evaluated at Kafr El-Hamam Agricultural Research Station, Sharkyia Governorate, Egypt, to stripe rust disease during 2013/2014 and 2014/2015 growing seasons under artificial inoculation. The evaluation included epidemiological parameters, i.e. final rust severity (%), area under disease progress curve (AUDPC), relative area under disease progress curve (r-AUDPC) and rate of disease increase (r-value) as well as yield components, i.e. estimated and actual percentage loss of 1000 kernel weight and grain yield/feddan. All tested cultivars Gemmeiza-7, Gemmeiza-9, Gemmeiza-10, Gemmeiza-11, Sids-1, Sids-12 and Sids-13 showed significant differences in disease parameters and yield components. Fast disease development was observed with Sids-12, Gemmeiza-11 and Gemmeiza-7 cultivars. Furthermore, they gave the highest values of estimated and actual percentage loss of 1000 kernel weight and grain yield/feddan compared to the other tested cultivars. On the other hand, stripe rust development was slow with Gemmeiza-10 and Gemmeiza-9 cultivars. They gave the lowest values of estimated and actual percentage loss of the 1000 kernel weight and the grain yield/feddan. Accordingly, there were strong positive relations between epidemiological parameters and yield components during the two seasons. The relation between FRS (%) and estimated loss (%) of 1000 kernel weight and grain yield/feddan was more stable than AUDPC, rAUDPC and r-value. Therefore, it can be concluded that the loss (%) of yield/feddan can be predicted from FRS (%). Moreover, the obtained results gave evidence to the importance of chemical control application in all cultivars against stripe rust disease particularly with Sids-12, Gemmeiza-11 and Gemmeiza-7. It seems that these results are reasonable for the explanation of economic threshold obtained from fungicide applications against stripe rust disease in wheat fields in Egypt. | ||
| Keywords | ||
| AUDPC; Puccinia striiformis; wheat and yield losses | ||
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